A border security supporter loads a shotgun into a vehicle before he and fellow supporters head to the U.S. - Mexican border to observe and report any signs of illegal immigration to the U.S. Border Patrol.

A group of Minutemen and border security supporters gather together, what they call a muster, at the Pio Pico RV Resort & Campground, southwest of Jamul, before heading to the U.S. - Mexican border to observe and report any signs of illegal immigration to the U.S. Border Patrol on Saturday, May 5, 2018.